Reland "[Darwin] Disable NSAsserts in release builds. #860"

[hellohuanlin]

Need to make sure this doesn't fail the CI for engine repo.

List which issues are fixed by this PR. You must list at least one issue.

If you had to change anything in the flutter/tests repo, include a link to the migration guide as per the breaking change policy.

Pre-launch Checklist

• I read the Contributor Guide and followed the process outlined there for submitting PRs.
• I read the Tree Hygiene wiki page, which explains my responsibilities.
• I read the Flutter Style Guide recently, and have followed its advice.
• I signed the CLA.
• I listed at least one issue that this PR fixes in the description above.
• I updated/added relevant documentation (doc comments with ///).
• I added new tests to check the change I am making, or this PR is test-exempt.
• All existing and new tests are passing.

If you need help, consider asking for advice on the #hackers-new channel on Discord.

[hellohuanlin]

Need to make sure this doesn't fail the CI for engine repo.

[hellohuanlin]

This is still pending the other build to pass. Let me convert it to draft